Significant Accounting Policies - Additional Information (Detail)		1 Months Ended	12 Months Ended
	Oct. 15, 2024	Jan. 31, 2013	Dec. 31, 2024 USD ($) Segment Branch shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2013 USD ($)
Business Acquisition [Line Items]
Common stock exchange			1
Number of branch locations | Branch			10
Number of branch offices | Branch			2
Allowance for credit losses for held to maturity securities			$ 68,000	$ 56,000
Mortgage and commercial loans period			90 days
Credit card and personal loans period			180 days
Credit card loan accrual period			90 days
Minimum required sustained performance			6 months
Outstanding awards			$ 0	0
Interest or penalties accrued			$ 0	$ 0	$ 0
Stock options outstanding | shares			0	0	0
Stock dividend, percentage	2.00%		2.00%	2.00%	2.50%
Maximum value of repurchased stock under inflation reduction act			$ 1,000,000
Nondeductible percentage excise tax on repurchases of corporate stock			0.01
Outstanding dilutive securities | shares			0	0	0
Debt securities available for sale securities accrued interest allowance for credit loss			$ 1,900,000
Allowance for credit losses for available for sale securities			$ 0
Debt instrument term			10 years
Investment, Type [Extensible Enumeration]			us-gaap:USTreasuryBillSecuritiesMember
Project defaults utilization period for third-party forecast			2 years
Reversion period to average economic forecast for remainder for portfolio life			1 year
Review threshold of loans experiencing financial difficulty with relationship exposure for collateral dependent			$ 100,000
Number of operating segment | Segment			3
Undivided profits			$ 50,351,000	$ 42,105,000
O 2024 Q4 Dividends [Member]
Business Acquisition [Line Items]
Dividends declared date	Oct. 15, 2024
Dividends payable date	Nov. 18, 2024
Dividends record date	Oct. 28, 2024
Series B [Member]
Business Acquisition [Line Items]
Dividends rate		5.30%
Voting rights			The preferred stock has no voting rights
Series C [Member]
Business Acquisition [Line Items]
Dividends rate						5.30%
Voting rights			The preferred stock has no voting rights
Preferred Stock Series B and Series C [Member]
Business Acquisition [Line Items]
Preferred stock issued						$ 10,700,000
Dividends rate						5.30%
Voting rights			The preferred stock has no voting rights
Interchange and Card Transaction Fees, Net [Member]
Business Acquisition [Line Items]
Noninterest income fees			$ 1,200,000
Accounting Standards Updated 2014-09 [Member]
Business Acquisition [Line Items]
Gross interchange and card transaction fees			3,100,000	3,000,000	$ 2,800,000
Interchange and card transaction related network costs			$ 1,900,000	$ 1,700,000	$ 1,600,000
ASU 2016-13 [Member]
Business Acquisition [Line Items]
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2023
Change in accounting principle, accounting standards update, adopted			true
ASU 2022-02 [Member]
Business Acquisition [Line Items]
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2023
Change in accounting principle, accounting standards update, adopted			true
Minimum [Member] | Furniture, Fixtures and Equipment [Member]
Business Acquisition [Line Items]
Useful lives			5 years
Minimum [Member] | Leasehold Improvements [Member]
Business Acquisition [Line Items]
Useful lives			10 years
Minimum [Member] | Building [Member]
Business Acquisition [Line Items]
Useful lives			10 years
Maximum [Member] | Furniture, Fixtures and Equipment [Member]
Business Acquisition [Line Items]
Useful lives			7 years
Maximum [Member] | Leasehold Improvements [Member]
Business Acquisition [Line Items]
Useful lives			39 years
Maximum [Member] | Building [Member]
Business Acquisition [Line Items]
Useful lives			39 years
U.S. Government Agencies [Member]
Business Acquisition [Line Items]
Allowance for credit losses for held to maturity securities			$ 0
Cabarrus Bank and Trust Company [Member]
Business Acquisition [Line Items]
Date of capitalization of new wholly-owned subsidiary			Apr. 10, 2003
Anson BanCorp Inc [Member]
Business Acquisition [Line Items]
Acquisition			Jan. 19, 2000
Gateway Mortgage Inc [Member]
Business Acquisition [Line Items]
Acquisition			Aug. 04, 2000
Uwharrie Mortgage Inc [Member]
Business Acquisition [Line Items]
Date of subsidiary incorporation			Apr. 07, 2004